Half to william it



(No Model.)

' L. V. BROWN.

GOMMUTATOR BRUSH FOR DYNAMOS. No. 428,073. Patented May 20, 1890.

( w'i lmeooao ,M WM $231.4 2 614% UNITED STATES PATENT OFFICE.

LEIVIS VAN BROIVN, OF ASHEVILLE, NORTH CAROLINA, ASSIGNOR OF ONE- IIALF TO XVILLIAM I-I. INLOES, OF SAME PLACE.

COMMUTATOR-BRUSH FOR DYNAMOS.

SPECIFICATION forming part of Letters Patent No. 428,073, dated May 20, 1890.

Application filed August 15, 1889. Serial No. 320,819. (No model.)

To ctZZ whom it may concern:

Be it known that I, LEWIS VAN BROWN, a citizen of the United States, residing at Asheville, in the county of Buncombe and State of North Carolina, have invented certain new and useful Improvements in Cominuta or-Brushes for Dynamos and Electric Motors; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

Figure 1 is a perspective view of a brush. Fig. 2 is a transverse section on line 00 00,1 ig.

1. Fig. 3 shows a modification.

This invention relates to an improved com- :o mutator-brush t'or dynamos and electric 1110-,

tors.

In this kind of devices it has been usual to construct them of several layers of copper held together by several rivets, so as to make practically a solid strip. The presentinvention consists in the construction hereinatte r pointed out.

In the annexed drawings, the letter A indicates the brush, consisting of the several 0 strips a. These strips have an end b flush together where they are held by a rivet c. The other ends are loose and are arranged in sets (Z and 6, one set 0 being a little back of the other set (Z, or all the ends may be flush 3 5 together. Surrounding these loose ends is a keeper or sliding clamp B, held by friction. The better to assure this clamp staying on the brush a nick g may be cut in the top strip, and as the brush wears away and the 40 clamp is slipped upward another nick may be cut to hold it in place. Instead of the nick the clamp maybe held by a set-screw. As

shown in Fig. 3, a number of these nicks may be made in the top strip before the strips are put together; but the way shown in Fig. l is preferable, as the nick can be cut at any place whatever,instead of being put at a predetermined place.

A brush made as described is very elastic, and yet has sufficient stiffness to bear against the commutator shaft. Provision is made for wear, so as to keep up the elficieney of the brush.

The device thus described is a complete brush in itself, and is an article of manufacture which can be applied to any of the commutators in use. The brush is to be placed in the usual brush-holder, the keeper B being entirely distinct from the ordinary brushholder, such keeper B being av part of the brush structure.

I am aware that a brush has been made of layers; but as far as I know these layers have been loosely inserted into the ordinary this holder, whereas I use a special keepcr distinct from the holder.

Having described my invention, what I claim is- 1. As a new article of manufacture,a commutator-brush consisting of several strips held rigidly together at one end and loosely at the other, and provided with a keeper placed around the loose ends, such keeperbeing part of the brush structure and distinct from the ordinary brush-holder, as set forth.

2. A coinlmitator-brush consisting of sev eral strips held rigidly together at one end and loosely at the other, the loose ends being held by a sliding clamp and one outside strip having a nick, as set forth.

In testimony whereof I affix my signature in presence of two witnesses. I

LEVIS VAN BROVN.

\Vit-nesses:

E. D. MONROE, WM. W. WEST.

brush-holder, and are only held together by 65 

